Seismic Response Comparison of Full-Scale Moment-Resisting Timber Frame and Joint Test Result

Abstract

This paper presents the seismic performance of the moment-resisting timber frame (MRTF). In Japanese urban areas, there are many urban small houses, and it is difficult to design a wooden building to ensure both the seismic performance and the comfortable plan that effectively makes use of small and constrained sites, and it also lacks flexibility in the design. Therefore, expectations are rising for high performance of MRTF using residential members. In this study, to clarify the seismic performance and the dynamic behavior under the heavy seismic wave, we conducted a full-shaking table test of the 2-story MRTF composed of residential members with short sides. The structure was designed by the allowable stress design (ASD) to resist 1.5 times the earthquake ground motion required in Japanese Building Standard Law (BSL) and linear analysis under frequent loading conditions (snow, wind, and earthquake events corresponding to a return period of approximately 50 years), and the unidirectional full-scale shaking table tests were conducted. The structure did not collapse up to a peak ground acceleration of 0.87 g and experienced ∼1/20 rad of maximum interstory drift. This indicates that an MRTF designed by the method can secure the seismic performance for a large earthquake. The time-response analysis was also conducted based on the joint tests, but the stiffness of the analytical result is little lower than the experimental result. Then, we tried the parameter identification using quality engineering to reproduce the experimental behavior. The results indicated that the moment resistance of the joint was higher because of the stressed-skin effect of the floor.